Thermionic tube



Sept 27, 1932. A, KNA'BNER ET AL 1,879,321

IHERMIONIC TUBE Filed. Dec. 51, 1950 INVENIORS A KNABNER BY *1? mrdmaiav Patented Sept. 27, 1932 UNITED STATES t PATENT oFFICEY. 1

ALBERT xneinvnn AND JoHAnN mcnrnn, or nnnnm, GER-MANY. ASSIGNORS moTELEFUNKEN GESELLSCHAFT FUR DRAH'ILOSE TELEGRAPHIE M. 13.11., or BERLIN,

GERMANY, A CORPORATION OF GERMANY' THERMIONIC TUBE Application filedDecember 31, 1930, Serial No. 505,766, and in Germany January 6, 19 30.

Thermionic tubes have been disclosed in the prior art in which .theelectrode supply leads are brought through-what is known as a squash atone end of the vacuous vessel. Thermionic tubes of this kind offer theadvantage that they are easily manufactured.

The present invention discloses a method of providing tubes of this sortwith sockets or holders. According to the invention, the mechanicalsecuring of tubes upon the holder is insured by the aid of traction ofthe tubes against the holder produced by wires enclosed within thesquash without cementing. These fused-in or sealed-in wires whereby thetubes are pulled against the base of the socket may be providedseparately (dummy wires) or else may constitute the current-supply leadsfor the tubes. Since the wires confined in the squash are mostly lyingin one plane, it is suitable to dispose the squash planar on the surfacewhere it comes to lie against the tube holder, or, if desired, toprovide it with a flange as shown in Figs. 1 and 2.

Referring to the attached drawing, S denotes the plus, I denotesinsulating material in which the said pins are secured and supported.

It is moreover advantageous to provide a guide bar F or the like on thetube holder adapted to prevent tilting of the tube in relation to theholder. The construction of such guiding element turns out to beparticularly simple if the tubular pins provided on the tube holder, andwith which the sealedin wires are united by soldering, clamping, or thelike resulting in a condition of tension, are split at the end turnedtowards the squash so that they result in claws (Fig. 3.). These clawsmay be bent around a flange provided on the squash and serve foraflordin mech anical supporting for the tube. uch tube holders, whichare especially well suited for the supporting of externally controlledtubes having an oval or flat cross-sectional shape are most suitablymade dissymmetric in such a way that the proper introduction of theholders into the corresponding sockets will be assured from the outset.Ifdesired, a suplementary pin may be provided, said in eing disposeddissymmetrically with re erence to the others, and serving, forinstance,for the connection of the control electrode;

trodes and having at one end an outwardly projecting press, a basecomprising an insulating member fitted to said press and having contactpins connected to said electrodes, and wires sealed into said press toproject outwardly with their outer ends secured to said member toproduce tension in said wires, whereby said member is held in positionon said press solely by said wires.

2. An electrical discharge tube compris-f ing a tubular glass envelopeenclosing electrodes and having at one end an outwardly projectingpress, a base comprising an insulating member shaped to fit snuglyagainst the end of said press and provided with contact pins, andleading-in wires sealed into and extending thru said press with theirinner ends connected to said electrodes, and their outer ends to saidcontact pins to place the outer portions of said wires under sufficienttension to hold said base in place on said press.

3. An electrical discharge tube comprising a tubular lass envelopeenclosing electrodes and closed at one end by a press having anoutwardly projecting flattened end, wires sealed into said press'toproject outwardly from said flattened end and connected inside saidenevolpe to said electrodes, and a base comprising an insulating memberwith a flat portion adjoining the end of said press and contact pinsfixed in said member, the projecting ends of said wires being secured tosaid contact pins toput said wires under tension and thereby hold saidbase in position on said press solely by said wires.

4. An electrical discharge tube comprising a tubular glass envelopeenclosing electrodes and having at one end an outwardly projecting presswith a flanged outer end, leading-in wires sealed into said press toproject from said end, and a base comprising an insulating member havingcontact pins and a clamp to engage said flanged end of V said press,said pins being secured to said leading-in wires to put them undersufficient tension to hold said base inposition.

5. An electrical discharge tube comprising a tubular glass enevolpeenclosing electrodes and having at one end an outwardly projecting presswith a flanged outer end, a base comprising an insulating member and atubular contact pin fixed in said member, ;the inner end of said contactpin being split to form a claw for engaging the flanged outer end of thepress, and a wire sealed into said press to project outwardly with itsouter end secured to said pin.

ALBERT KNABNEZR.

J OHANN RICHTER.

